Abstract
The polymerization of methyl methacrylate (MMA) initiated with methylaluminum tetraphenylporphyrin was accelerated at room temperature upon addition of triphenylboron and tris(pentafluorophenyl)boron Lewis acids, affording polymers of narrow MWD with M n s close to the expected values. The living character of the polymerization was demonstrated by the two-stage polymerization of MMA. The trialkylboron tri-n-butylboron neither accelerated nor terminated the polymerization. Use of other boron-containing Lewis acids such as BF 3 -OEt 2 , BCl 3 , triphenyl borate, and trimethylbororin (trimethylcyclotribororane) for the polymerization of MMA resulted in rapid termination under similar conditions
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